Building a reports in power BI

Hi I require help building reports in Power BI. The data is being pulled through using o-data feeds and a template of the initial report exists, it is just is no longer working and i do no have the expertise/experience to determine why. As well as this initial report I would also need help to build 3 or 4 more reports.

Please note that this Job would require work on site at our offices in London

Thanks